package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

//    新增菜品和对应的口味数据
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
//        向菜品表插入1条数据
        dishMapper.insert(dish);

//        获取insert语句生成的主键值
        Long dishId=dish.getId();
//        向口味表插入数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
//        遍历flavors,将dishId赋值给遍历到的每个dishFlavor的idvo
        if (flavors!=null && flavors.size() >0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
//            向口味表插入n条数据
            dishFlavorMapper.insertBath(flavors);
        }

    }

//    菜品分页查询
    @Override
    public PageResult pageQuery(DishPageQueryDTO pageQueryDTO) {
        PageHelper.startPage(pageQueryDTO.getPage(), pageQueryDTO.getPageSize());
        Page<DishVO> page=dishMapper.pageQuery(pageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    @Transactional
//    批量删除菜品
    @Override
    public void deleteBatch(List<Long> ids) {
//        判断当前菜品是否可以删除---是否存在起售中的菜品
        for (Long id : ids) {
            Dish dish=dishMapper.getById(id);
            if(dish.getStatus()== StatusConstant.ENABLE){
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

//        判断当前菜品是否能够删除---是否被套餐关联了
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds!=null && setmealIds.size()>0){
//            当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

//        删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //        删除菜品关联口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //根据菜品id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);
        //根据菜品id集合批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

//    根据id查询菜品和其口味
    @Override
    public DishVO getByIdWithFlavor(Long id) {
//        根据id查询菜品
        Dish dish = dishMapper.getById(id);
//        根据菜品id查询口味数据
        List<DishFlavor> dishFlavors=dishFlavorMapper.getByDishId(id);
//        将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

//    根据id修改菜品基本信息和对应的口味信息
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表基本信息
        dishMapper.update(dish);
       //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors!=null && flavors.size() >0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBath(flavors);
        }
    }

//    根据分类id查询菜品
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish=Dish.builder().
                categoryId(categoryId).
                status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

//    条件查询菜品和口味
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        //    根据分类id查询菜品
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d: dishList){
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }
        return dishVOList;
    }

//    菜品起售停售
    @Transactional
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder().id(id).status(status).build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> ids = new ArrayList<>();
            ids.add(id);
//            select sd.setmeal_id from setmeal_dish sd where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
            if (setmealIds!=null && setmealIds.size()>0){
                for (Long setmealId:setmealIds){
                    Setmeal setmeal = Setmeal.builder().id(setmealId).status(StatusConstant.DISABLE).build();
                    setmealMapper.update(setmeal);
                }
            }

        }
    }
}
